Zeaxanthin epoxidase

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Zeaxanthin epoxidase
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EC no. 1.14.13.90
CAS no. 149718-34-3
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Zeaxanthin epoxidase (EC 1.14.13.90, Zea-epoxidase) is an enzyme with systematic name zeaxanthin,NAD(P)H:oxygen oxidoreductase. [1] [2] [3] [4] [5] [6] [7] This enzyme catalyses the following chemical reaction

zeaxanthin + 2 NAD(P)H + 2 H+ + 2 O2 violaxanthin + 2 NAD(P)+ + 2 H2O (overall reaction)
(1a) zeaxanthin + NAD(P)H + H+ + O2 antheraxanthin + NAD(P)+ + H2O
(1b) antheraxanthin + NAD(P)H + H+ + O2 violaxanthin + NAD(P)+ + H2O

Zeaxanthin epoxidase is a flavoprotein (FAD) that is active under conditions of low light.

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References

  1. ↑ Büch K, Stransky H, Hager A (November 1995). "FAD is a further essential cofactor of the NAD(P)H and O2-dependent zeaxanthin-epoxidase". FEBS Letters. 376 (1–2): 45–8. doi: 10.1016/0014-5793(95)01243-9 . PMID   8521963.
  2. ↑ Bugos RC, Hieber AD, Yamamoto HY (June 1998). "Xanthophyll cycle enzymes are members of the lipocalin family, the first identified from plants". The Journal of Biological Chemistry. 273 (25): 15321–4. doi: 10.1074/jbc.273.25.15321 . PMID   9624110.
  3. ↑ Thompson AJ, Jackson AC, Parker RA, Morpeth DR, Burbidge A, Taylor IB (April 2000). "Abscisic acid biosynthesis in tomato: regulation of zeaxanthin epoxidase and 9-cis-epoxycarotenoid dioxygenase mRNAs by light/dark cycles, water stress and abscisic acid". Plant Molecular Biology. 42 (6): 833–45. doi:10.1023/A:1006448428401. PMID   10890531.
  4. ↑ Hieber AD, Bugos RC, Yamamoto HY (October 2000). "Plant lipocalins: violaxanthin de-epoxidase and zeaxanthin epoxidase". Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology. 1482 (1–2): 84–91. doi:10.1016/s0167-4838(00)00141-2. PMID   11058750.
  5. ↑ Frommolt R, Goss R, Wilhelm C (July 2001). "The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach". Planta. 213 (3): 446–56. doi:10.1007/s004250100589. PMID   11506368.
  6. ↑ Frommolt R, Goss R, Wilhelm C (2001). "Erratum Report. The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach". Planta. 213 (3): 492. doi:10.1007/s004250100619.
  7. ↑ Matsubara S, Morosinotto T, Bassi R, Christian AL, Fischer-Schliebs E, Lüttge U, Orthen B, Franco AC, Scarano FR, Förster B, Pogson BJ, Osmond CB (October 2003). "Occurrence of the lutein-epoxide cycle in mistletoes of the Loranthaceae and Viscaceae". Planta. 217 (6): 868–79. doi:10.1007/s00425-003-1059-7. PMID   12844265.
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